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Note 10 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Number of
Shares

   

Average
Exercise
Price

 

Outstanding as of December 31, 2024

    2,750,429     $ 8.92  
                 

Issued

    25,434       1.88  

Expired

    (401,449 )     29.24  

Exercised

    (1,434,002 )     1.07  

Outstanding as of June 30, 2025

    940,412     $ 12.14  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Six Months Ended

June 30, 2025

Expected dividend yield

    0.0 %

Expected stock price volatility

    99.4 %

Risk-free interest rate

    4.37 %

Expected life

 

5 years